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The approximate allowable axial compressive stress under earthquake load condition in reinforced concrete is:  Where, fck = crushing stress of 15 cm cube at 28 days crushing 

The approximate allowable axial compressive stress under earthquake load condition in reinforced concrete is:  Where, fck = crushing stress of 15 cm cube at 28 days crushing  Correct Answer 0.30 <span style="">f</span><span style=" line-height: 0; position: relative; vertical-align: baseline; bottom: -0.25em; font-size:10.5px;">ck</span>

Explanation:

As per IS 456: 2000:

For design purposes, the compressive strength of concrete is assumed to be 0.67 times the characteristic strength of concrete. The partial factor of safety of 1.5 is also to be applied in addition to this.

Characteristic Strength of concrete Cube = fck

Characteristic strength of concrete in actual structure = 0.67fck

Design strength of concrete in flexural compression = 0.67fck/ partial FOS = 0.67fck/ 1.5 = 0.45f­ck

The approximate allowable axial compressive stress under earthquake load condition in reinforced concrete is: 0.30 fck

Where, fck = crushing stress of 15 cm cube at 28 days crushing 

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